NORTH AMERICAN GEOTRUPINAE — ^HOWDEN 209 



In April 1952a marked burrow yielded a pair in a 15-inch'[^burrow 

 without any sign of brood activity. fin early May twOj^burrows 

 yielded solitary females, but nothing else. On May 16 there were 

 signs of surface activity and a female was collected at light. One 

 burrow, 15 inches deep, yielded a pair of subtropicus, but again there 

 was no indication that they were provisioning a cell. 



On June 8 fresh burrows were in evidence, but were not as numerous 

 as they had been previously. On June 14 one 18-inch burrow yielded 

 a solitary female, while investigation of a 20-inch burrow produced a 

 pair at the end of a vertical shaft. On the same day one of the bur- 

 rows that had been marked all winter was examined. After digging 

 to a depth of 30 inches a very callow male was found. Again no defi- 

 nite brood cell could be found in the loose sand, but a quantity of the 

 black humus was nearby. 



The following week, on June 21, a burrow was examined that had 

 been newly made four weeks previously. A solitary female was found 

 at a depth of 14 inches. The burrow extended beyond, and digging 

 was continued to a depth of 22 inches, at which point a large, third- 

 stage larva was fomid. A quantity of poorly compacted, fine, black 

 humus mixed wdth sand and containing some fungus mycelia was 

 within 1 inch of the spot where the larva was found. While it was not 

 possible to definitely conclude that this was the material used for food, 

 it seemed likely that it was so used. The larva of the closely related 

 Bolboceras darlingtoni (Wallis) left the compacted food mass of humus 

 and formed a pupal cell in the sand one-half to 1 inch from the food 

 material. The larval Eucanthus may have moved from its food supply 

 to pupate. The burrow push-ups of Eucanthus are almost identical 

 to that depicted for darlingtoni (pi. 10, fig. 1) and it seemed probable 

 that the larval habits were similar. 



Further digging during June and July 1952 yielded only adults, and 

 no further information was obtained concerning the larval habits. 



The adults of subtropicus apparently have a long period of adult 

 activity and a moderately long period of oviposition. This conclusion 

 tends to be supported by the third-stage larvae being collected in 

 June and July and callow adults being found in mid-June and late 

 July. 



Two larvae of Eucanthus lazarus subtropicus collected bear the 

 following data: One third-stage larva found at a depth of 24 inches 

 at Southern Pines, N. C, on July 24, 1951, by H. Howden and Ritcher; 

 one third-stage larva found at a depth of 22 inches with female at 

 Southern Pines, N. C, on June 21, 1951, by H. and A. Howden. 



Adult specimens from Southern Pines differ considerably from 

 western (Arkansas) Eucanthus, exhibiting the characteristics of sub- 



